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Rapid-infiltration disposal of kraft mill effluent

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Rapid-Infiltration Disposal of Kraft Mill Effluent
A.T. WALLACE, Professor
Department of Civil Engineering
University of Idaho
Moscow, Idaho 83843
GARRY GRIMESTAD, Professor
University of Montana
Missoula, Montana 59801
DICK LUOMA, Chief Chemist
MARC OLSON, Project Engineer
Hoerner Waldorf Corporation
Missoula, Montana 59801
INTRODUCTION
The Hoerner Waldorf Corporation mill in Missoula, Montana, currently produces
about 1,150 tons of predominantly unbleached pulp per day by the Kraft process. The
wastewater resulting from this level of production averages about 16 million gallons per day
(mgd). This wastewater undergoes clarification and is then sent to a series of lagoons of
various sizes and depths. The flow pattern for this lagoon system, which occupies over 700
acres, is roughly a series arrangement, and is shown by Figure 1.
Figure 1 — Existing lagoon system.
Some biological stabilization of the effluent is achieved within the lagoon system;
however, the primary mode of biological action is anaerobic. Therefore, the lagoon system
506

Rapid-Infiltration Disposal of Kraft Mill Effluent
A.T. WALLACE, Professor
Department of Civil Engineering
University of Idaho
Moscow, Idaho 83843
GARRY GRIMESTAD, Professor
University of Montana
Missoula, Montana 59801
DICK LUOMA, Chief Chemist
MARC OLSON, Project Engineer
Hoerner Waldorf Corporation
Missoula, Montana 59801
INTRODUCTION
The Hoerner Waldorf Corporation mill in Missoula, Montana, currently produces
about 1,150 tons of predominantly unbleached pulp per day by the Kraft process. The
wastewater resulting from this level of production averages about 16 million gallons per day
(mgd). This wastewater undergoes clarification and is then sent to a series of lagoons of
various sizes and depths. The flow pattern for this lagoon system, which occupies over 700
acres, is roughly a series arrangement, and is shown by Figure 1.
Figure 1 — Existing lagoon system.
Some biological stabilization of the effluent is achieved within the lagoon system;
however, the primary mode of biological action is anaerobic. Therefore, the lagoon system
506